Quotation from: The Notebooks of Leonardo Da Vinci

Written by: Leonardo da Vinci


[4] When the transmitted shadow is intercepted by a plane surface
placed opposite to it and farther away from the luminous body than
from the object [which casts it] it will appear proportionately
darker and the edges more distinct.


[Footnote: The diagram which, in the original, is placed above line
2, is similar to the one, here given on page 73 (section 120).--The
diagram here given in the margin stands, in the original, between
lines 3 and 4.]

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